Battery charging system for airplanes



Jan. 3, 1933. A. HYLAND BATTERY C HARGING SYSTEM FOR AIRPLANES FiledMarch 9, 1929 IN VEN TOR ATTORNEY I such equipment.

' condition.

'of my invention. I To su ply the necessar energy for energzingt eanodes andcat odes employcdin 'gh frequenciy sigpaling systems, analter-- t a small propeller mount- NITED s'TATrsL- PATENT orrlcs A. orwAsme'ron, ms'rnrcr or 001mm, Assrenoa r0 wnmn mmo, new, orm roux, n.Y., A coaroaA'rron or DELAWARE nA'rrmrcnAneima area-ma roa AmrLAna-s '1provide a battery charging system for airplanes whereby the storagebatteries are- 7 fcharged when the plane is in the air.

Another object of my invention is to pro-- vide a battery chargingsystem for airplanes having-high frequency signaling equipment a withouta ding materially to the weight of A further'object of my'invention isto provide means for utilizing the apparatus normally employed insignaling systems for maintaining the storage batterles m the pewercircuits thereof in a normally charged In airplanes and airshi it ismaterial that the weight of the high requency signaling apparatiis bereduced as much as possible consistent with eflicient operationjof theapparatus. It has heretofore been objectionable to employ massivestorag: batteries as sources of electrical energy t energizing the radioapparatus due rimarily 'togthe wei ht of such batteries. '0 equip thecraftwit heavy I duty high ampere hour capacity a batteries increases t's ob ectionable feature.

30 To equip the craft with small batteries, thereby reducing the weight,presentsthe, disadvantage of limited service from such a source.

and increases'the possibility 0f nonoperation 7 due to an exhaustedbattery. The. battery as charging system for airplanes of my inventionavoids many disadvantages and objec-* tionable features of maintainingsi apparatusinairplanes inservice condition. 7

A better understanding of iny invention .40 can be had {from thedescription following and 'fromthe accompanying schematic draw aling ingillustratingthe I attery charging system natorprovide wi ed .onthe'shaft thereof isactuated by the 1m, semi R0. mm.

the air caused by the'propeller of the air- I such alternators aresomethe' air lane motive distress it infrequent that the radio as notbeen 0 rative due to a discharg plane motor. times driven directl bower. In times 0 apparatuswas inbattery. The

-. a ternator' was actuated if the lane was in motion; however, thegenerate alternatin current couldnot be satisfactorily employ toenergize certain circuits of the transmitter or of thereceiven; Such analternator :as

above-referred to. is illustrated in the accompanying drawing and isdesignated by the reference character 1. Alternator 1 comprises anarmature 2 having collecting rings connected to an armature winding.Brushes 2a bearing on the collector'rings are connected' to the radioapparatus through shielded through the air. The field circuit of thealternator includes winding ,3 which winding is/that which produces themagnetic flux. To produce the magnetic; flux a source of is .Wimdiwiththe winding. h chsource is. generally referred t as the exciten;f'The-exciter in this instance comprises an armature 4; providedwithan'arma ture'winding-and commutator, the i 'armature winding 4connecting the field winding 5- by means-of brushes against'the com- Imutator.-

Field winding fi 6f the alternator is connected in series with theoutput of the e'xciter which is herein shown as of the shunt wound type.Connectedalso in this series connection is the'l -usual field rheostat 6and noenergy is present infield winding 3 due" I? winding-9 ofelecttomagnetic relay 13. When to non-actuation \ofqarmature- 4, noenergy causes contact members12 tobe in open-pois" present in winding 9of electromagnetic relay 13. When winding 9is not energz'ed,'

armature 10 of relay 13 is not actuated. This sition therebyinterrupting the circuit to baten winding 9 is energized,-

-'tery- 7. Spring 11 returns armature 10 of armature 10 of relay 13 isactuated thereby closing contact members 12 and hence completing thecircuit to battery 7-. Armature 10 of relay 13 is electrically connectedto winding 8 which winding has a substantially lower resistance than theresistance of winding 9. Should no energy be generated in the 'exeitercircuit 4 5 contact members 12 would open thereby preventing dischargeof the battery 7 througn the windings of exciter 4-5. Winding 8 ofelectromagnetic relay 13 is adequate to carry suflicient current for thecharging of battery 7 Relay 13 is a reverse current relay with res ectto the fact that 15 a discharge of battery to the exciter windin'gs isprevented when the exciter is not revolving. I

The connections between the field winding 3 of the alternator and theelectromagnetic relay 13 are shielded by the conductive cas ingindicated at 14 for preventing stray elec-- tromagnetic fields which areestablished from interfering with the operation. of signal receivingapparatus on the aircraft.

By my invention the use of a separate generator for charging the storagebattery on aircraft is avoided. The heat normally dispensed by thealternator field rheostat is by my invention usefully employed tomaintain the charge of the storage battery in the radio system.

any modifications of my invention are 7 possible and it is to beunderstood that the embodiments of my invention are not to be 3restricted by the foregoing specification or by the accompanying drawingbut only by the scope of the appended claim. What I claim as new anddesire to secure by Letters Patent of the United States is as follows:

A battery charging system comprising in combination with a storagebattery, an alternator, means for driving said alternator, means forexciting the field winding of said alternator comprising a shuntconnected exciting generator mechanically connected to said alternator,means connecting the field winding of said alternator, said shuntconnected exciting generator, and said storage -battery in seriesrelation, whereby the exciting current from said generator is suppliedto the field of said alternator through [said storage battery forcharging said storage battery, and a relay in circuit with said lastmentioned means for automatically opening the circuit to said storagebattery for preventing discharge thereof through the field winding ofsaid alternator and the exciting generator when the driving means is notoperating.

I LAWRENCE A; HYLAND.

